Two-button switch



Aug. 22, 1950 E. G. GAYNOR ATTORNEY Aug. 22, 1950 E. a. GAYNOR 2,519,899

TWO-BUTTON SWITCH l l 23,' l l 30 2A ff f f 221 74/9; ,'29

3967 ze mfg/27 24//0 205, 37 F1 (El 34 /8 38 56 53 INVENTOR. IDWJN EAYNDR ATTORNEY Patented Aug. 22, 1950 UNITED STATES ATENT FFICE TWOLEUTTONSWITCH Edwin v G. Gaynor, Faireld, lConn.

Appiication'November 30, 1946, Seriai No. 713,279

11' Claims. 1;

This inventionrelates to new and useful improvements in fluorescent lighting apparatus-and has particular relationto a switch'ior the control or fluorescent lamps.

Thev objects and advantagesK4 ofthe invention Willffbecome apparent from-a-considerationof 'the following detailedV` description takenin connection withv theaccompanying drawings wherein a' satisfactoryy embodiment of the invention is shown.- However,A itis-to be understood' that the: invention is not limited to= the detailsy disclosed but includes allA such'- variations and modifications as-fall within tliespirit of' the invention and scope of' the'appendedvv claims.

In the drawings:

Fig; l is asidel elevationalt View,` showing a switch" constructed in accordance with thev pres'- entinvention;

Fig; 2 is a top-plan viewfthereof;l

Fig. 3J is an end viewlooking as from' thev right in Fig. l;

Fig. li is a" sectional viewta'ken along the'plane ofthe-line 4"-4foffFig- 2';

Fig. 5 is a: detailed sectional' view taken as along the line 55-5 of Fig. All;

Fig. 6 is a' view similar tof Fig. 4 but with the oir-button of the switch latched in depressed or open circuit position:

Fig; 7- is an isometri'civieW-of'" a latching means employed;

Fig. 8 is a 'sectional` view takenv as along the plane of'theline 8'-8 of Fig; 4;

Fig. 9 is a sectional view taken. as along the plane ofy theline 9;-9 of"` Fig. 8';

Fig. 10 shows a wiring diagram;

Fig. 11 is'a view similar to Fig. 1' butshowing a` modication of the wiring terminals'. and condenser mounting, the latter including.A a strain reliever feature;

Fig. 1`2isa bottom plan view of Fig. 11\;`

Fig; l3'i`s an end elevation view off Fig. 11;

Fig..v 14 is. a, central' transverse sectionaly view through the condenser mounting;

Fig. 15 is a bottomplan View of' an insulator employed over the condenser;l

Fig. 16' is an enlarged detail sectional View showing the manner in which the wiring terminals of Fig.. 1lV are mounted;' and Fig. 17 is an isometric vievvv showing one of such terminals alone;

Referring inA detail to. the drawings, and at rst more particularly to Figs. l-l0.l the present switchincludes a housing generally designated Ilandshown as formed" of apair. ofmolded parts I'I`andl2`. structurally, theparts I-I, and I2?. are

lil

I?. substantially duplicates of one another. On its ends, part I2 includesbead-like portions I3'while the par-t II has somewhat similar portions I4. Drive screws i5 pass through the portions I3 and into'sockets in the portions I6.. and serve to lock thehousingparts ii and i2 together.

Parts IIl and i2 are complementary and when secured together bythe screws i5 have their open sides in abutting relation whereby the housing Iii is substantially hollow and includes a bottom wall Ef, a top wall i'i, and side walls I3 andv I9'.A Each of the parts I-i and i2, on the inner surface oi' its bottom wall and adjacent its sidewall, is provided with narrow raisedportions orlands 2t and 2 iy adjacent its respective ends andV inter-g mediate its ends with a raised' portion or land 2-2 of greater thickness than the-portions 29 and 2l1 and being integral with its end-portions 23* and 24 substantiaily of the'saine height of the portions Z and 2I- but spacedY slightly from them;

Additionally, the side walls of the parts I II and I2 are thickened in their end corner portions as at 25' and fand formed with said side Walls'and with the top wall Il of each part is a thickened portionY 2 having a recess or trough 2i entering through its bottom edge and opening through its side. In the end portions of the parts adjacent their side walls, socket-like recesses 29 and 3] are formed and in one-the end` wall where the parts'abut they are provided with complementary depressions which in the assembly combine to provide a socket 3 i. Somewhat similarly, in their bottom'walis the parts are provided with recesses or depressions which are complementary and whichin the assembly combine to provide a depression or recess 32;

Integral with the outer or top walls of the parts are annular extensions 33 and S and the opening through the extension 3d is aligned with the socket or depression 32. These extensions or annular projections 33' and 3d formV guides forv manuals or push buttons 35 and 36. Inv their outer surfaces the sides i9' and E9- oi the parts IIL and I' are provided with three similar depressions 3?, 3S and 39. Openings Il@ through the upper portions of` the depressions 3l enter the sockets 29' at opposite sides of the body illwhile openings fi IV inthe inner ends of thev depressions S8` enter the recesses 28 at the mid portions of the body and openings i2 at the other end of the body and in the inner portions of the recesses 39 enter the sockets 3i), at said other end of the body.

Withinveachor" the body portions I.I and I2 are contact elements 43, 4t and 45, respectively.

As best shown in Figs. 4, 6 and 9, the element 43 comprises a piece of iiat stock, as of brass, bronze, or the like, bent to provide a pair of spaced bottom at portions 43 and 41, an intermediate raised portion 48 and an outwardly extending arm 39 at its upper end bent to provide a curved or hook-like portion 50. The elements d3 are located in the respective parts il and l2 of the housing in positions directly opposite one another and with their ats 55 and 41 on the raised portions or lands 2li and 23 respectively and with their curved portions 55 partly located in the recesses 29.

Substantially received in the recesses 31 in the opposite sides of the housing i3 are similar terminals 5l each having an inwardly extending arm portion 52 entering the curved or hook portion 58 of that contact element 43 adjacent its side. Preferably, these arms 52 are soldered to the mentioned contact portions. ments 5E] is provided with a binding post or screw 53' for the attachment of leads and these screws (see Fig. 5) enter Sockets 55 in the respective parts of the body.

The elements Lid are also each formed from a length of fiat spring metal and each includes a contact arm 55 having a tit-like projection 5S on its under side, an intermediate U-shaped portion 51 and an arm 58. The arms 55 and 53 are at the opposite sides o the portion 51 and inteagainst the side walls of the parts ll and l2 with the U-shaped portion 51 of each element substantially received in the notch or recess 28 of the lug 21 of its part and with the juncture of the arms of its U-shaped portion and its arms 55 and 53 located on the land or raised portion 22. The relative sizes of the parts are such that the elements 33 are inserted laterally and are held in place by engagement with the lugs 21 and the lands or hats 22. However, it will be appreciated that the arms 55 and 58 of the elements are free to flex from the normal positions in which they are shown in Figs. 4 and 9.

Element l5 is also formed up from a piece of iat stock and comprises a pair of at portions 55 and 55 and an intermediate depressed portion 5i located between the iats 59 and 55. Additionally, the element includes an upstanding arm 52, Ycorresponding with the -arm 49 of theV element 43, the Lipper end of which is bent to provide a curved portion 63.

In the assembly, the ats 53 and 60 of element 55 rest on the raised portions or lands 23 and 2|, respectively, within the housing parts Il and l2 and, in addition, each element has its curved portion 63 received in the recess or socket 30 of its housing part. The depressed portions 6l of the elements are located between the spaced ends of the raised portions or lands 23 and 2| and in alignment with opposite edge portions of the socket or recess 32 in the bottom wall of the housing.

In the recesses 38 in the outer sides of the housing parts il and l2 are terminal members 65 each including an arm 65 extending through the openings ll and into the bite portion of the U-shaped portion 51 of the respective elements 45. Preferably, these arms E5 are soldered in the said bite portions to insure a good and lasting electrical connection. Each element 64 carries a binding screw or post 66. Similarly, terminal memberstl are located in the recesses 3S in the Each of the eleouter sides of the housing parts and each such terminal member includes an arm 58 passing through the opening 52 in said housing part and entering and soldered in the curved portion 63 of the element l5 located in said part. It will be understood that one each of the elements L33, 45 and 45, is located in each of the housing parts l l and i2.

The manual or push button 35, which in the present construction may be described as the starting button, has an annular enlargement '.59 at the inner side of the top wall l1 of the housing IU. This enlargement prevents casual movement of the button completely out of the housing and further the enlargement spans the arms 55 of the elements 53 located in the respective housing parts l! and l2. Somewhat similarly, at the inner side of the wall l1, the button 35 is provided with an enlargement 1E! of a diameter to prevent the button from moving completely out through said wall and also of a diameter to span the arms 5B of the two parallel elements d. Y

A stud 1I extends inwardly from the button 36 and is provided with a metallic or connecting headportion or disc 12 on its inner end. The .disc 12 is of a diameter to be freely received in the socket 32 and is of aV diameter to span the inner arms or portions 59 of the elements l5 and to close a circuit between said elements on engagement with the depressed portions 5l thereof. It is noted that the spanning member or head 12 is at the under side of the arms or portions 53 of the elements 45. On the shank or stern 'll and located at the outer or upper sides of said arms or portions is a disc or Ymember 13 of insulating material. This disc is not rigidv with the stem but is vsirnplylocated by the stem whereby the latter may pass through the disc and the function of the disc is to preventv any possibility of contact between the arms 53 of elements 4:3 and the'at portions 55 of the elements 45. k

At all times, the enlargement 69 of the button 35 is in engagement with the arms 55 of the elements F54 `whereby said arms either support the button 35 in projected position or are tending to move it to projected position when it is depressed or moved toward-circuit closing position. Similarly,u the Yenlargement leV of the button 3S is in engagement Vwith theV arms 58 of Said elements i313 whereby said arms are maintaining the button 35 in projected position or are constantly tending to move said button to a projected or circuit `closing position'. WithY the'str'uctu're thus f ar described, it will be understoodtha't inthe vnormal or projected position of the button 36, the head or element 12 is spanning land engaging the pair of elements 45 so that the latter are in closed circuit relation. Thus, the switch controlled by the button 36 is hereinafter referred to as a normally closed switch and in a Viiuorescent lighting circuit button 36' may be considered part of the 01T switch for de-energizing the light tubes. Button 35, controlling the" onl switch, must be depressed to flex the' arms 55 of the elements 44 to press their tit-like projections 56 into engagement with the raised portions 48 of the respective elements 43 to give a closed circuit relationship to the parts of the on switch. l Means are provided for latching the Qi switch in open circuit position. Such means comprisea slidable latch member 151, shown as molded of insulating material and comprising a body 15 having a flat under side 16 and opening through its upper side'having a recess 11', the wall 18 of which is inclined providing a cam surface; A stud 'I9 extendsfroml one end'ofthezbody 'l5 and at the other end of the-latter is asort of tooth portion 8U.

Intermediate the ends of. the body, the latter is provided with an elongated opening 8| which in the assembly accommodates a Screw 82. Also in the assembly, the bottom surface 16 of the latch 14 is disposed on the inner surface to the bottom wall l5 of the housing with its stud 19 entering the socket 3| wherein a coil spring 83 is located about said stud and is constantly pressing against the latch in an effort to move it toward the left in Figs. 4 and 6.

W'hen the switch is in use in a circuitwith a pair of lamps which are operating,.the parts are positioned as in Fig. 4. There it will be seen that the tooth-like portion 80 of the latch 14 is pressing against the enlargement of the off button 36 and that such button, as well as the on button 35, is in projected position. To stop the lamp, it is :merely necessary to depress the button 36, as from the position of Fig. 4 to that of Fig. 6. This carries the bridging member '|2 out of circuit closing relation with the depressed por tions 5| of the pair of elements 45.

Additionally, as the push button 36 is depressed, its enlarged portion 1|! is carried below the tooth 88 of the latch 14 and the spring 83, acting against said latch, shifts the same from the position of Fig. 4 to that of Fig. 6 locating the tooth above the enlarged portion 'IIJ of button 35. The elongated opening 8| in the latch permits of this movement relative to the screw 82 and when the latch isin this new position it will be clear that the arms 58 of the elements 44 may not shift the button 36 back to normal or projected position. The button 36 is latched in this depressed position and so the switch, of which said button forms a part, is locked in open or off position.

Now, to again start the lamp or lamps, the button is depressed. Asl this button is depressed, its enlarged diameter portion 69 engages the cam surface 'I8 of the slide 14 and forces the same to the right in Fig. 6 against the tendency of the coil spring 83. from over the enlarged portion 10 of the push button 35 whereupon the arms 58 of the elements 44 act to shift said button to its normal projected circuit closing position with its spanning member 'l2 in the position of Fig. 4 and closing a circuit between the portions 5| of the elements 45. Further, as the button 36 is depressed, it carries the arms of the elements 44 inwardly or downwardly bringing their tit-like portions 55 into engagement with the raised portions 48 of the elements 43. Thus, closing circuits between the respective elements 43 and the respective elements 44 of the switch.

Fig. l0 shows a suggested wiring diagram with the present switch included therein. In such diagram, the power line from any suitable source is shown at 34. and the return at 85. In this circuit a pair of fluorescent lamp tubes are shown at E@ and Bl. When the button 35 is depressed, moving the arms 55 of the elements 44 into circuit closing relation with the elements 43, the of the tube 85' and then through a wire 9| and an element 43, an arm 55 to a connection 92 through the latter to the filament 93 of said starting circuit is from the wire 84 through a ballast 8S to a wire B9, through a filament 95 lamp and out through a lead 94 to an element 45 and through the bridging disc 12 to the other element 45, thence to the return 85. For the lamp 8l, the starting circuit is through a ballast This withdraws the tooth i 5 95, Wirefg, iilament 91, wire 9.8A to an element 43 to an arm 55 to a leadQQ, filament |55. and connection lill to wire 94 above described.

After the lamps have beenV started; the button 35V is released so that itsswitch is open, but then the circuit is through the lamps as from the iilament 9e to the lament Q3r of lamp 85 and from the iilament 5i to the filament lfofi lamp 8l. Condensers |52 and |63. are connectedacrossthe respective switches controlled by the push button 35 to prevent broadcasting by the switches.

As here shown, these condensers are located against the under side of theV housing They are held in elongated pockets formed in an open sided insulation member ili (see Fig. l5). Preferably, such member is ofimpregnated cardboard or the like and retains the insulators in spaced relation since the membe-r includes an inwardly directed mid-portion |05. This insulating member |84 is received in a metal shell or housing |85 including a bottom wall Elli' and side wall portions E55, each provided at its upper edge with an outwardly extending portion i639 engaging against the bottom of the housing IU.

Beyond said portions' E59, the housing or. shell includes side portions liti engaging opposite sides of the housing l and each provided with a lug il bent inwardly and received in a recess il' formed in the side wall of the housing lil. These lugs areI bent in so that portions of the housing are clamped between the lugs and between the lateral portions of the shell |85 so that the shell is rather securely attached to the housing, clamping the condense-rs between the insulator ill and the bottom of the housing.

Additionally, the screw 32 above referred to, passes through the inwardly bent portion |55 of the insulator substantially midway the ends of the latter', and through the bottom wall lill of the shell |55. At the underside of said'shell a nut |i3, as a speed nut, on the screw or bolt 32 locks the latter in place and provides for the use thereof in the maintaining of the metal shell E55 of the insulator |84 against the housing IU'.

From the foregoing description it will be understood that I have provided a simple and inexpensive construction of a two-button switch for the control of fluorescent lamp circuits. The circuit breaking or the off switch 35 is of the normally closed type and I have lprovided means for locking it in open position to secure against casual starting of a iluorescent lamp such as might occur were the off switch of construction to be opened and then permitted to close.

Additionally, means is provided for latching the off. switch in open circuit position. Such means is automatically shifted to an inoperative position by the on switch manual when the latter is moved to close a circuit. The elements 44, in addition to comprising switch elements or contact elements, also comprise spring means for maintaining or constantly attempting to maintain the respective manuals of the push buttons in their projected positions, which position of the button 35 represents an: open circuit position and whiclrposition of the button 36 represents a closed circuit position.

The switch of Figs. ll' through 17 is very similar to that previously described and includes many identical parts. To avoid unnecessary description here, where the parts in Figs. l1 Athrough i7 are those* previously described, they aregiventhe same. reference characters. Thus, in these figures, the condensers |02 and |03, protected by the insulating member |04, are held against the underside of the housing VI by means of a metal shell H4 including a bottom wall and side portions |I'6.

At the upper ends of the portions IS, the metal of the shell is carried outwardlyas at II'I, then upwardly along the sides of the housing IIJ, as at H8, and then includes lugs H9 bent into the sockets or resesses H2. Additionally, the bolt or screw 82 passing through the housing I0 passes through the opening |20 in the insulator |04 and then through the bottom wall H5 of the shell I'I4. One of thenutsI I3 is on the. lower end of the bolt 82. As thus ar described, the shell ||4 is substantially the same as the shell IIJB ofthe figures first described.

However, shell I I4 Yincludes threev pairs of lateral extensions |2I, |22 and |23, each such pair including one extension at each side or edge of the shell. These extensions have openings I 24 formed through their outer portions. Preferably, the openings are not formed by punching out the metal, but are formed by displacing the metal so .as to form or provide short nipples |25 to reinforce the holes and to avoid the formation of sharpcorners. This structure of shell including the extensions I2I, |22 and |23 provide strain relievers for leads to the switch as will appear.

The modification includes a modified construction of terminals. These terminals are arranged in pairs in the recesses 31, 38 and39 in the outer sides of the respective parts II and l2 of the body Il. The terminals diametrically opposite one another comprise a pair. Thus, in the drawing we have pairs of terminals |26, |21 and |28, all of the same construction and one of which is shown in detail in Fig. 17. Thus, the terminal |25 includes a flat body portion |29 having at its inner side a short tubular portion and at its upper end having a trough-like-portion I3! from the bottom wall of which is lanced and pressed a tooth or pawl |32.

With this construction, the terminal is easily and quickly and securely mounted on the housing Ill. Thus, the trough-like portion |3| of a terminal is entered through the opening 4D, 4| or 42, depending on the location of the terminal, and is soldered or otherwise Xed to the appropriate portion of an element 43, 44 or 45, as the location may permit. Additionally, Ithe tubular portion |38 of the terminal enters the appropriate socket 54 in the housing.

As the terminal is being mounted on the housing, the tooth or pawl |32 is somewhat deflected and the terminal and housing are forced together until this tooth or pawl snaps over the side wall I8 or the side wall I9, depending upon which side of the housing the terminalis being mounted, as to the position of Fig. 16; This locks the terminal to the housing.Y Thereafter, the end of a lead, as the lead |33, is inserted intovthe tubular portion |30 and secured therein with a drop of solder or the like. f

As suggested in Figs. l1 and 13, the various leads |33, |34 and |35 from the switch are carried through the openings |24 in the different arms |2I, |22 and |23. With this construction, any pullon Ythe leads or rattails mustbe in or substantially in the planes of the body |729 of the terminals and atright angles to any pull likely to separate the terminals from the body. It will be understood that anyvpull o n a lead will be downwardly asV the switch is shown in the drawf ings andwillY not be outwardly or laterally of the switch. l From the above, itwill be seen that in the modiflcatiomthe terminal elements are of simple and inexpensive construction and are very Veasily secured on the; switch body. The elements are secured without the use of screws or the like and the connection'of the leads to the elements are also made without the use of screws or the like. In addition, in the 'modification the means for securing the condensers to the switch body includes strain relief construction copoerating with the terminals used to the end that the terminals will notbe casuallydisconnected from the switch should a pull be exerted on any lead.

. Having thus lset forth the nature .of `my in- .v.ention,A what I claim is: Y

.1. In a switch, a body of insulating material, a rst pairof spacedstationary Ycontacts in said body, apair of movable contacts in said body and normally in open circuit relation with said stationary contacts, a manual normally maintained in` one position by said movable contacts but adapted to be operated to shift the latter into circuit closing relation with said stationary contacts and to be returned to normal position by the movable-contacts when released, a'second pair of stationary contacts in said body, a single movable contact in said body and normally held in circuit closing relation with said second pair of stationary contacts by spring extensions of said pairiof movable contacts, and a manual movable with saidsingle movable contact and in the normal position of the latter occupying Va projecting position and adapted to be shifted to move said single movable contact into opencircuit relation with said second pair. of stationary contacts. l Y 1 2. In a switch, a body of insulating material, a first pair .of spaced stationary contacts in said vbody,'a pair of movable contacts `in said body and normally in open circuit relation with said stationary contacts, a manual normally maintained in one position by said movable contacts 1 but adapted to be operated to shift the latter into circuit closing relation with said stationary contacts and to be returned to normal positionv by the movable contacts when released, a second pair of stationary contacts in said body, -a single movable contact in said body and normally held in Vcircuit closing relation .with said second pair of stationary contacts by spring extensions o said pair of 'movable contacts, a manual movable with said single ymovable contact and in the normal position of the latter occupying'a projecting position andl adapted to be shifted to movev said single `movable contact into open circuit -relation with said second pair of stationary contacts, means automatically operable to latch said manual inthe last named position when moved thereto, and means thereafter operable to release said latching means on the rst named manual being next operated to move said pair of movable contacts into circuit closing relation with the iirst pair of spaced stationary contacts.

3. In a switch, a bodyvof insulating material, a iirst pair of spaced stationary contacts in said body, a pair of movable contacts in said body and normally in open circuit relation with said stationary contacts, a manual normally maintained in one position by said movable contacts but adapted to be operated to shift the latter into circuit closing relation with said stationary contacts `and to be returned to normal position by the movable contacts when released, a second pair of stationary contacts in said body, a single movable contact in said body and normally held in circuit closing relation with said second pair of stationary contacts by spring extensions of said pair of movable contacts, a manual movable with said single movable contact and in the normal position of the latter occupying a projecting position and adapted to shifted to move said single movable Contact into open circuit relation with said second pair of stationary contacts, each of said stationary contacts comprising a metallic piece having a pair ci arms substantially at right angles to one another and of which one arm comprises a circuit closing arm and the other an arm for connection of a lead, said stationary centacts arranged in said housinfr with their last mentioned arms all extending substantially parallel, terminal members on the outer sides of said housing, said terminal members each including an arm extending through the side walls of said housing and electrically connected with the second mentioned arms of said stationary contacts.

4. In a switch, a body of insulating material, a first pair of spaced stationary contacts in said body, a pair of movable contacts in said body and normally in open circuit relation with said stationary contacts, a manual normally maintained in one position by said movable contacts but adapted to be operated to shift the latter into circuit closing relation with said stationary contacts and to be returned to normal position by the movable contacts when released, a second pair of stationary contacts in said body, a single movable contact in said body and normally held in circuit closing relation with said second pair of stationary contacts by spring extensions oi said pair of movable contacts, a manual movable with said single movable contact and in the normal pos-tionoi the latter occupying a projecting position and adapted to be shifted to move said single movable contact into open circuit relation with said second pair of stationary contacts, a latch within said housing, means mounting said latch for sliding movement, said latch adapted in one position to overlie part of and secure said last mentioned manual in open circuit position, means constantly tending to move said latch to said position, and cooperating means between said latch and the rst mentioned manual for sliding said latch back to released position on operation of said first mentioned manual to circuit closing position.

5. In a switch, a body of insulating material, a stationary contact in said body, a movable contact in said body normally in open circuit relation to said stationary contact, a manual normally maintained in one position by said movable contact but adapted to be operated to shift the latter into circuit closing relation with said stationary contact and to be returned to normal position by the movable contact when released, a pair of stationary contacts in said body, a single movable contact in said body and normally held in circuit closing relation with said pair of iixed contacts by spring extensions of said movable contact, and a manual movable with said single movable contact and in the normal position of the latter occupying a projecting position and adapted to be shifted to move said single movable contact into open circuit relation with said pair or" stationary contacts.

6. In a switch, a body of insulating material, a stationary contact in said body, a movable contact in said body normally in open circuit relation to said stationary contact, a manual normally maintained in one position by said movable contact but adapted to be operated to shift the latter into circuit closing relation with said stationary Contact and to be returned to normal position by the movable contact when released, stationary contacts in said body, a single movable contact in said body and normally held in circuit closing relation with said stationary contacts by spring extensions of movable cona manual movable with said movable contact and in tl o .normal position of latte occupying a projecting position adapted to bl shifted to move said single movable contact into open circuit relation with said stationary contacts, means automatically operable to loclz said manual in the last named position when moved thereto, and means thereafter opera le torelease said locking means on the 'First named manual being next operated to ove said movable contacts into circuit closing relation vwith i' .at stationary contact.

'7. In a switch, a stationary contact, a movable contact, a push button for moving sa. contact into engagement ufith said tact, said stationary contact compi.v arm normally engaged by said l adapte to return said push button position when the latter is moved to arm into engagement with said and is then released, a pai contacts in said body, a bi dging gaging and closing a circuit through of stationary contacts, a second push nested with said bridging member ling the position of the latter, a se arm on said movable contact structure erable to support said second push butu in tion with said bridging member closing aci between the contacts ci lonely to return the second push b on being moved therefrom and then .s y

8. In a switch, a body of insulatn nat a iirst pair of spaced stationary contacts in said body, a pair of movable contacts in said body and normally in open circuit relation with said stationary contacts, a manual normally maintained in one position by said movable contacts but adapted to be operated to shift the latter into circuit closing relation with said stationary contacts and to be returned to normal position by the movable contacts when released, a second of stationary contacts in said body, a single movl able contact in said body and normally held in circuit closing relation with said second pair of stationary contacts by spring extensions of said pair of movable contacts, a manual movable with said single movable contact and in the normal position of the latter occupying a projecting position and adapted to be shifted to move said single movable cont-act into open circuit relation with said second pair of stationary contacts, a latch within said housing, means mounting latch for sliding movement, said latch adapted in one position to overlie part oi and secure said last mentioned manual in position with said single movable contact in open circuit relation with said second pair of stationary contacts, means constantly tending to move said latch to said position, cooperating means between said latch and the rst mentioned manual for sliding said latch back to released position on operation of said iirst mentioned manual to circuit closing position, said latch having an elongated slot therein, and a bolt passing through said housing and said slot and comprising a guide means for said latch.

9. In a switch, a body of insulating material, a stationary contact in said body, a movable contact in said body normally in open circuit relation to said stationary contact, a manual nor-a mally maintained in one position by said movable contact but adapted to be operated to shift the latter into circuit closing relation with said stationary contact and to be returned to normal position by the movable contact when released, a pair of stationary contacts in said body, a single movable contact in said body and normally held in circuit closing relation with said pair of stationary contacts by spring extensions of said movable contact, a manual movable with said single movable Contact and in the normal position of the latter occupying a projecting position and adapted to be shifted to move said single movablercontact into open circuit relation with said pair of stationary contacts, a latch Within said housing, means mounting said latch for sliding movement, said latch adapted in one position to overlie part of and secure said last mentioned manual in position with said single movable Contact in open circuit relation with said second pair of stationary conta-cts, means constantly tending vto move said latch to said position, cooperating means between said latch and the first mentioned manual for sliding said latch back to released position on operation of said first mentioned manual to circuit closing position, said latch having an elongated slot therein, and a bolt passing through said housing and said slot and comprising a guide means for said latch.

10. In a switch, a body of insulating material, a rst pair of spaced stationary contactsin said body, a pair of movable contacts in said body and normally in open circuit relation with said stationary contacts, a manual normally maintained in one position by said movable contacts but adapted to be operated to shift the latter into circuit closing relation with said stationary contacts and to be returned to normal position by the movable contacts when released, a second pair of stationary contacts in said body, a single movable Contact in said body and normally held in circuit closing relation with said second pair of stationary contacts by said pair of movable contacts, a manual movable with said single 'movcircuit closing arm and the other an arm for connection of a lead, said stationary contactsarranged in said housing with their last mentioned arms all extending substantially parallel, terminal members on the outer sides of said housing, said terminal members each including an arm extending through the side Walls of said housing and electrically connected with the second mentioned arms of said stationary contacts, a metal member at the inner side of said switch, said member having a perforation therethrough for each of said terminal members and located Vin Awardly of the latter, and said periorations adapted for the passage of leads to said terminal members whereby said metal member functions as a strain reliever.

11. In a switch, a body of insulating material, a rst pair of spaced stationary contacts in said body, a pair of movable contacts in said body and normally in open circuit relation with said stationary contacts, a manual normally maintained in one position by said movable contacts but adapted to be operated to shift the latter into circuit closing relation with said stationary contacts and to be returned to normal position by the movable contacts when released, a second pair of stationary contacts in said body, a single movable contact in said body and normally held in circuit closing relation with said second pair of stationary contacts by said pair of movable contacts, a manual movable With said single movable contact and in the normal position of the latter occupying a projecting position and adapted to be shifted to move said single movable contact into open circuit relation with said second pair of stationary contacts, each of said stationary contacts comprising a metallic piece having a pair of arms substantially at right angles to one another and of which one arm comprises a circuit closing arm and the other an arm for connection of a lead, said stationary contacts arranged in said housing with'their last mentioned arms all extending substantially parallel, terminal members on the outer sides of said housing,

. and said terminal members each including an arm extending through the side Walls of said housing and electrically connected with the second mentioned arms of said stationary contacts.

EDWIN G. GAYNOR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number vName Date 2,331,181 Gaynor Oct. 5, 1943 2,355,303 Knudsen Aug. 8, 1944 

